Hi,
Replying to my own post for reason of the problem and a typical solution.
On 11/9/05, Joshua Slive <[EMAIL PROTECTED] > wrote:On 11/8/05, Devendra Singh < [EMAIL PROTECTED]> wrote:
> But, the problem is that when I try to access
> http://ds.india.noida/dstest.html the SSI
> /mycomps/testsuccess.html also gets parsed from the Front Apache.
Or, in other words, subrequests are not getting proxied.Yes, SubRequests are not getting Proxied from SSI calls.
> RewriteEngine On
> RewriteRule \.(gif|jpg|png|txt|css|js|ico|swf)$ [OR]
> RewriteRule !\/mycomps\/.* - [last]
> RewriteRule ^/(.*)$ http://ds.india.noida:8080/$1 [proxy]
This looks quite bogus to me. As far as I know, there is no [OR]
option to RewriteRule. And you shouldn't be escaping forward slashes
in your regex. I'm surprised this works at all.Yes, it works. However, if I comment the line:#RewriteRule \.(gif|jpg|png|txt|css|js|ico|swf)$ [OR]that also suits my purpose.About escaping of forward slashes, point noted, Thanks.
On the original problem of subrequests and proxies, I don't recall
whether or not this works correctly. I imagine it should.But, the original problem still remains. How do I force the subrequest due to SSI call from within a request getting served from Front Apache to go to Back Apache?
Joshua.Thanks Joshua for your response.
But, I am still waiting for more expert hints.DS
Problem Diagnosis -->
If I access http://ds.india.noida/mycomps/testsuccess.html directly it works okay, i.e., gets served from Back Apache:
10.216.204.64 - - [09/Nov/2005:12:12:52 +051800] [ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (2) init rewrite engine with requested uri /mycomps/testsuccess.html
10.216.204.64
- - [09/Nov/2005:12:12:52 +051800] [ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (3) applying pattern '^/mycomps/testsuccess\.html$' to uri '/mycomps/testsuccess.html'
10.216.204.64
- - [09/Nov/2005:12:12:52 +051800] [ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (3) applying pattern '^/(.*)$' to uri '/mycomps/testsuccess.html'
10.216.204.64 - - [09/Nov/2005:12:12:52 +051800] [
ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (2) rewrite /mycomps/testsuccess.html -> http://ds.india.noida:8080/mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:12:52 +051800] [ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (2) forcing proxy-throughput with http://ds.india.noida:8080/mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:12:52 +051800] [ds.india.noida/sid#8e829b8][rid#8f0bf78/initial] (1) go-ahead with proxy request proxy:
http://ds.india.noida:8080/mycomps/testsuccess.html [OK]
If I access http://ds.india.noida/dstest.html which has <!--#include virtual="/mycomps/testsuccess.html" --> (dstest.html has to be served from Front and /mycomps/testsuccess.html should be served from Back Apache, but both are passed through):
10.216.204.64 - - [09/Nov/2005:12:13:27 +051800] [ds.india.noida/sid#8e829b8][rid#8f16740/initial] (2) init rewrite engine with requested uri /dstest.html
10.216.204.64 - - [09/Nov/2005:12:13:27 +051800] [ds.india.noida/sid#8e829b8][rid#8f16740/initial] (3) applying pattern '^/mycomps/testsuccess\.html$' to uri '/dstest.html'
10.216.204.64
- - [09/Nov/2005:12:13:27 +051800] [ds.india.noida/sid#8e829b8][rid#8f16740/initial] (1) pass through /dstest.html
10.216.204.64 - - [09/Nov/2005:12:13:27 +051800] [ds.india.noida
/sid#8e829b8][rid#8f2e908/subreq] (2) init rewrite engine with requested uri /mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:13:27 +051800] [ds.india.noida/sid#8e829b8][rid#8f2e908/subreq] (3) applying pattern '^/mycomps/testsuccess\.html$' to uri '/mycomps/testsuccess.html'
10.216.204.64 - - [09/Nov/2005:12:13:27 +051800] [ds.india.noida/sid#8e829b8][rid#8f2e908/subreq] (1) pass through /mycomps/testsuccess.html
So, the Problem is that in case of "subreq" via SSI call, the mod_rewrite.c is simply refusing to deal with a proxied subrequest (and thus SSI).
I checked the modules/mappers/mod_rewrite.c and found the following around line 1828 (httpd-2.0.55):
/*
* Ignore this rule on subrequests if we are explicitly
* asked to do so or this is a proxy-throughput or a
* forced redirect rule.
*/
if (r->main != NULL &&
(p->flags & RULEFLAG_IGNOREONSUBREQ ||
p->flags & RULEFLAG_PROXY ||
p->flags & RULEFLAG_FORCEREDIRECT )) {
continue;
}
In my opinion (of limited knowledge of Apache internals) the line with "RULEFLAG_PROXY" may be the culprit. I commented the line:
/* p->flags & RULEFLAG_PROXY || */
and recompiled the Front Apache. Voila, now its giving the desired effect of rewriterule on subrequest via SSI.
So, now on accessing http://ds.india.noida/dstest.html, the result is:
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida
/sid#99a29b8][rid#9a2bf68/initial] (2) init rewrite engine with requested uri /dstest.html
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a2bf68/initial] (3) applying pattern '^/mycomps/.*$' to uri '/dstest.html'
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a2bf68/initial] (1) pass through /dstest.html
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [
ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (2) init rewrite engine with requested uri /mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (3) applying pattern '^/mycomps/.*$' to uri '/mycomps/testsuccess.html'
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (3) applying pattern '^/(.*)$' to uri '/mycomps/testsuccess.html'
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (2) rewrite /mycomps/testsuccess.html -> http://ds.india.noida:8080/mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (2) forcing proxy-throughput with
http://ds.india.noida:8080/mycomps/testsuccess.html
10.216.204.64 - - [09/Nov/2005:12:35:53 +051800] [ds.india.noida/sid#99a29b8][rid#9a3a150/subreq] (1) go-ahead with proxy request proxy:
http://ds.india.noida:8080/mycomps/testsuccess.html [OK]
I would like to seek opinion of the expert list members / developers, whether this modification is okay and would it have any bad impact somewhere else?
Thanks for your time !
DS
--
Devendra Singh
S-4/A-116, Shalimar Garden Ext-II
Sahibabad, Ghaziabad (UP) - 201005 INDIA
Ph# +91+11-2637495
Mobile# +91-9818342483
